289 results about "Ammonium nitrate" patented technology

The invention relates to the technical field of guanidine nitrate preparation, in particular to a method for preparing guanidine nitrate by a continuous dynamic tubular reaction process, which comprises the following steps: uniformly mixing dicyandiamide, target ammonium nitrate and target ammonium carbonate according to a mass ratio of 1: (1-3): (1-0.5); conveying the uniformly mixed material to a feeding section in a dynamic tubular reactor through a first conveying screw rod for mixing treatment, wherein the dynamic tubular reactor further comprises a heating section, a reaction section and a cooling section; sequentially conveying the target mixed material to a heating section for heating melting treatment, a reaction section for synthesis reaction treatment and a cooling section for cooling forming treatment through a second conveying screw rod to obtain an initial product; conveying the initial product into a cooling and crushing device for cooling and slicing to obtain a target guanidine nitrate product. According to the method disclosed by the invention, the mass and heat transfer efficiency can be improved, the online quantity and liquid holdup of the material are reduced, meanwhile, the raw material ratio and the reaction path are optimized, and the safety and the product purity are improved.

The invention provides a device and a method for producing ammonium nitrate by taking air and water as raw materials. Compared with the prior art, the device is composed of the nitrogen generator, the plasma discharge device, the fixed bed reactor and the absorption tower, sliding arc discharge is adopted, the fixed bed reactor is heated through heat generated by discharge, NH3 and NOx are synthesized through nitrogen and water discharge, and the ammonium nitrate solution is finally obtained through oxidation absorption. According to the method, only air and water are used as raw materials, high-temperature and high-pressure reaction conditions in the industrial ammonium nitrate synthesis process are avoided, the synthesis process driven only by renewable energy sources is realized, and the method can be applied to the scenes of distributed energy storage, small-scale production of agricultural nitrogen fertilizers and the like.

The invention discloses an ammonium nitrate solution concentration regulation reaction kettle with an explosion-proof function, and belongs to the technical field of reaction kettle equipment. The reaction kettle comprises a reaction kettle body, the bottom of the reaction kettle body is communicated with a discharge valve, a solution can be uniformly heated through an electric heating plate in a groove in the bottom of the inner wall of the reaction kettle body, and explosion caused by gas generated by decomposition of ammonium nitrate due to over-high local temperature is avoided; the stirring rod is matched with the top motor, so that an ammonium nitrate solution in the reaction kettle can be fully stirred, and the concentration distribution of the solution is uniform. The circular rings arranged on the upper surface and the lower surface of the reaction kettle body and the anti-explosion pipe fixedly connected with the circular rings effectively enhance the overall structural strength of the reaction kettle, the air outlet pipe of the top circular ring is matched with the air inlet pipe of the bottom circular ring, and external cold air enters the space between the anti-explosion pipe and the reaction kettle body, so that the reaction kettle body is uniformly cooled; and then the gas is discharged to the outside from the gas outlet pipe. The explosion-proof device has the advantage of good explosion-proof effect.

In the device, a plurality of low-temperature plasma reactors are fixed in an absorption liquid storage tank in an array manner, a quartz tube is immersed in liquid in the absorption liquid storage tank, and a plurality of through micropores are uniformly distributed in the bottom of the quartz tube; the lower end of the connecting fastener is fixed with the orifice of the quartz tube, and the side edge of the connecting fastener is provided with an air tube; the metal electrode is fixed through the upper end of the connecting firmware and extends into the quartz tube to serve as a high-voltage electrode; the discharge power supply is connected with the metal electrode and the ground electrode, so that the low-temperature plasma reactor generates bubble plasma in liquid; the electrolytic cell is communicated with an absorption liquid storage tank through a switch pipeline, the working electrode is provided with foamy copper as an electro-catalysis material, and the working electrode, the platinum wire counter electrode and the silver / silver chloride reference electrode form a three-electrode electrochemical structure to electrocatalytically synthesize ammonium nitrate in the electrolytic cell.

A composite oil phase and composite emulsion matrix for site-mixed emulsion explosive and preparation methods therefor. The composite oil phase is divided into material A and material B, wherein in the material A, a high-viscosity polyisobutylene maleic anhydride amine esterification derivative is used as a primary emulsifier to increase the strength and thickness of an emulsification film of an emulsion matrix, thereby improving the stability of the emulsion matrix; in the material B, a low-viscosity polyisobutylene maleic anhydride amine esterification derivative and SP-80 are used as primary emulsifiers to regulate the ammonium nitrate dissolution rate of the emulsion matrix, thereby improving the sensitization characteristic of the emulsion matrix; and the emulsion matrix prepared from two composite oil phases can effectively improve the water resistance of the emulsion matrix while the problems of high-temperature over-sensitization and low-temperature insensitivity are solved, so that the explosion quality is guaranteed.

The invention discloses a colloidal emulsion explosive with high storage stability and a preparation method thereof. The raw materials for preparing the emulsion explosive comprise ammonium nitrate, calcium nitrate, water, a compound emulsifier, compound wax and a special foaming agent. Wherein the composite emulsifier is a modified span-80 composite emulsifier obtained by carrying out esterification reaction on an anionic carboxylate emulsifier and multiple hydroxyl sites of span-80, and the composite emulsifier has high molecular weight, so that the space volume of a lipophilic group is increased, and an interfacial film is tighter; the special foaming agent is composed of sodium nitrite, zinc nitrate, gelatin peptone, Tween 80, phosphoric acid, urea and water, the gelatin peptone is a green pure natural raw material, the surface tension of an emulsion matrix is effectively reduced, the contact area of the foaming agent and the emulsion matrix is increased, the foaming efficiency is catalyzed by zinc nitrate, and bubbles are good in stability and not prone to escaping due to Tween 80. The use of the compound emulsifier and the special foaming agent improves the blasting performance and storage stability of the emulsion explosive.

The invention relates to an explosive wastewater green treatment process which comprises the following steps: S1, a pretreatment stage: pumping collected explosive wastewater into a micro-nano air flotation device to remove suspended solids, oils and surfactants in the explosive wastewater; s2, a resin adsorption stage: pumping the pretreated explosive wastewater into a resin adsorption system, and selectively adsorbing and removing ammonia nitrogen pollutants in the wastewater through resin; s3, a regeneration and desorption stage: carrying out sleeve washing and regeneration and desorption on the resin subjected to adsorption saturation by adopting dilute nitric acid so as to desorb and separate ammonia nitrogen adsorbed in the resin; and S4, a product recycling stage: carrying out impurity removal treatment on a concentrated regeneration desorption solution generated by desorption, and then adjusting the pH value to obtain an ammonium nitrate solution which is recycled in an explosive production process. And S5, a waste liquid treatment stage: adjusting the pH value of the resin adsorption effluent, and conveying the resin adsorption effluent to a sewage station for combined treatment. According to the method, the ammonia nitrogen pollutants in the explosive wastewater can be removed, and meanwhile explosive production raw materials can be recycled.

The invention relates to the field of emulsion explosives, in particular to a preparation system and method of an emulsified porous granular ammonium nitrate fuel oil explosive. The invention relates to a preparation system of an emulsified porous granular ammonium nitrate fuel oil explosive, which comprises ammonium nitrate conveying equipment, ammonium nitrate fuel oil mixing equipment, a double-shaft mixer, a wood flour / adhesive mixing screw and packaging equipment, the dredging mechanism comprises a flattening assembly arranged behind the ammonium nitrate conveying equipment and a dredging assembly arranged behind the flattening assembly, and the flattening assembly flattens ammonium nitrate particles to assist the dredging assembly in dredging the ammonium nitrate particles; the adsorption mechanism is arranged behind the dredging mechanism and comprises a mixing assembly arranged behind the flattening assembly, a soaking assembly arranged behind the first mixing assembly and an adsorption assembly arranged behind the soaking assembly; the filtering mechanism is arranged below the adsorption mechanism and is used for filtering the oil liquid used in the adsorption assembly.

The invention discloses an efficient preparation method of a small-grain-size rhenium-containing alloy, and relates to the technical field of refractory metal powder metallurgy. The preparation method mainly comprises the following steps: preparing oxide composite powder by adopting a combustion synthesis method and taking soluble transition metal salt, ammonium perrhenate, hydrogen peroxide or ammonium nitrate and fuel as raw materials, reducing the oxide composite powder through hydrogen to obtain nano alloy powder, and performing compression molding and high-temperature sintering through a hydraulic press to prepare the rhenium-containing alloy material. The material has the advantages of being high in purity, uniform in doping, excellent in mechanical performance, resistant to corrosion, long in service life and the like, and a new breakthrough is brought to the field of powder metallurgy of refractory metal.

The invention provides a composite oil phase material for improving water resistance and explosion performance of a porous granular ammonium nitrate fuel oil explosive. The composite oil phase material comprises the following raw materials in parts by mass: 80-100 parts of naphthenic oil, 2-7 parts of an amino-containing dispersant, 1-5 parts of a nanoscale molecular sieve and 0.3-3 parts of an oleate derivative stabilizer. The composite oil phase material can effectively improve the explosion performance and the water resistance of the on-site mixed porous granular ammonium nitrate fuel oil explosive. The raw materials are environment-friendly and easy to obtain, and high popularization value is achieved. The composite oil-phase material provided by the invention is high in flash point and low in condensation point, can replace diesel oil with the grade of minus 40 DEG C to minus 20 DEG C to be applied to preparation of a porous granular ammonium nitrate fuel oil explosive mixed and loaded on site in winter, the intrinsic safety of the explosive production process is improved, and the explosive preparation cost is reduced. The composite oil phase material provided by the invention can also provide good weak alkaline water resistance for the porous granular ammonium nitrate fuel oil explosive.

The invention provides an intelligent copper release nano preparation triggered by a magnetic effect as well as a preparation method and drug application thereof. The preparation is ES (at) Fe3O4 (at) SiO2-Cu; the preparation method comprises the following steps: adding FeCl3. 6h2O and CH3COONa into ethylene glycol, and carrying out hydrothermal reaction, washing and magnetic separation; dispersing the ferric oxide magnetic fluid in ammonia water for ultrasonic treatment, adding an ethanol solution containing 20% of tetraethyl silicate and a copper nitrate mixed solution for continuous reaction, washing with ethanol water, performing magnetic separation, dispersing the Fe3O4-coated SiO2-Cu fluid in an ammonium nitrate isopropanol solution, adding isopropanol water for ultrasonic treatment after magnetic separation, washing with ethanol water, replacing water with pure ethanol, and performing vacuum drying to obtain Fe3O4-coated SiO2-Cu; dispersing the mixture and ES in water, and carrying out violent ultrasonic oscillation; and dialyzing the bag overnight, and collecting to obtain ES (at) Fe3O4 (at) SiO2-Cu. The device is high in penetration depth, suitable for deep tumor treatment and good in heating efficiency under an alternating magnetic field.

A biological sample preservative contains 1.0 to 10.0 mol / L of a substance having a polyatomic monovalent cation represented by a chemical formula NH4+ or a compound comprising the polyatomic monovalent cation. As the substance having the polyatomic monovalent cation represented by the chemical formula NH4+ or the compound comprising the polyatomic monovalent cation, for example, ammonium sulfate or ammonium nitrate can be used.

The utility model relates to an electric heating anti-crystallization ammonium nitrate aqueous solution sampling port device, which belongs to the technical field of chemical equipment and comprises a bottom plate, a solution storage tank is fixedly mounted at the top of the bottom plate, a sampling tube is fixedly connected to the outer side of the solution storage tank, and a high-performance heating unit is fixedly mounted on the outer side of the sampling tube. The device has the beneficial effects that the ammonium nitrate aqueous solution in the solution storage tank is discharged through the sampling pipe, and the temperature and the current of the high-performance heating unit can be monitored in real time and can be accurately adjusted according to actual requirements due to the matched use of the high-performance heating unit, the temperature sensor, the current sensor and the controller; according to the ammonium nitrate water solution sampling device, the heating effect is efficient and stable, accurate control over the temperature of an ammonium nitrate water solution sampling opening is achieved, the crystallization problem is effectively prevented, sampling smoothness and normal operation of equipment are guaranteed, and meanwhile energy consumption and maintenance cost are reduced.

The invention discloses a nitrate-containing waste liquid treatment method, which comprises: (1) waste acid treatment: diluting waste acid in a neutralization reaction kettle, adding ammonia water while stirring, controlling the temperature to be 70-95 DEG C, continuously adding ammonia water to adjust the pH value of the solution to be 7.5-10.0 after the neutralization is completed, and carrying out stirring distillation to obtain an ammonium sulfate nitrate aqueous solution or an ammonium sulfate nitrate crystal; (2) wastewater treatment: 1) wastewater steam stripping: transferring nitrate wastewater into a steam stripping kettle, adding a pH regulator to regulate the pH value to be 10-13, heating the steam stripping kettle to a boiling state by using steam, distilling, condensing and recovering nitrate in the wastewater; and 2) oxidation treatment: after steam stripping is finished, hydrogen peroxide is added into the steam stripping kettle in a boiling state, stirring reaction is performed, and the reacted wastewater can be discharged after reaching the standard. Compared with a traditional Fenton method and an activated carbon adsorption method, the method has the advantages that secondary pollutants Fe (OH) 3 generated by treatment and saturated activated carbon after adsorption can be avoided, harsh reaction conditions such as light, electricity and microwaves can be avoided, the operation cost is reduced, the method is safe, environment-friendly and free of secondary pollution, the nitrate removal rate can reach 100%, and the method is suitable for industrial production. The COD (Chemical Oxygen Demand) of the treated wastewater is less than 100mg / L, and the wastewater can reach the direct discharge standard.

Disclosed is a system for the production of urea ammonium nitrate (UAN), which is particularly suitable for processing relatively small ammonium nitrate waste streams into UAN. The system comprises a concentration for ammonium nitrate, a treatment section which allows recovering and recirculating nitrogen compounds entrained in vapor from the concentration section, and a pH control section allowing to adjust the pH of the processed ammonium nitrate waste stream to the extent necessary.

The invention relates to the technical field of pharmaceutical analysis, in particular to a method for detecting the content of guanidine nitrate by precolumn derivatization-high performance liquid chromatography, which comprises the following steps: oscillating and uniformly mixing a guanidine nitrate reference substance or sample and pure water at room temperature, adding sulfuric acid concentrated liquor in cold water bath to perform derivatization reaction, after the reaction is finished, placing at room temperature, and performing column chromatography to obtain the guanidine nitrate content. Adding liquid caustic soda for neutralization, carrying out gradient constant volume by using a mobile phase, and filtering by using a microporous filter membrane to respectively obtain a derivatization reference solution and a derivatization sample solution; and respectively injecting the derivatization reference substance solution and the derivatization sample solution into HPLC, recording peak areas, and calculating the content of guanidine nitrate in the sample by adopting an external standard method. The guanidine nitrate sample is pretreated through the precolumn derivatization reaction, the guanidine nitrate derivative generated through the reaction has the advantages of being high in stability and easy to separate, ammonium nitrate and nitric acid impurities can be effectively prevented from interfering the detection result, the explosive picric acid is not adopted in the detection method, and the detection method is simple, safe and easy to implement.

The invention discloses a powdery emulsion explosive with eutectic inorganic salt as an internal phase and a preparation method, and relates to the technical field of powdery emulsion explosives, the powdery emulsion explosive comprises the following raw materials by weight: 90-110 parts of eutectic inorganic salt and 5-7 parts of a composite oil phase; wherein the eutectic inorganic salt is prepared by recrystallizing ammonium nitrate and sodium chloride. Ammonium nitrate and sodium chloride are combined in a recrystallization manner, so that sodium chloride is uniformly distributed in ammonium nitrate crystals in a lattice doping manner, a molecular-level dispersion effect is realized, and the flame inhibitor is more uniformly dispersed in an inner phase; secondly, the eutectic inorganic salt has a synergistic decomposition peak at 210-240 DEG C, and chloride ions are released in advance to interact with active groups generated by explosion; under the combined action of the two factors, sodium chloride is used as a flame inhibitor to play a role more effectively at the flame front, the flame temperature is reduced, and flame propagation is inhibited.

The utility model discloses an ammonium nitrate solution concentration blending reation kettle with anti -explosion function belongs to reation kettle equipment technical field, the utility model discloses a reation kettle body is communicated with the discharge valve at reation kettle body bottom, can carry out even heating to solution through the electric heating plate in the reation kettle body inner wall bottom groove, avoid local temperature too high and cause ammonium nitrate to decompose gas and cause explosion, the cooperation design of stirring rod and top motor can carry out sufficient stirring to ammonium nitrate solution in reation kettle, make solution concentration distribution even. The annular ring and the explosion -proof pipe fixedly connected with the annular ring that reation kettle body surface sets up up and down, effectively enhanced the overall structural strength of reation kettle, the gas outlet pipe of top annular ring and the gas inlet pipe of bottom annular ring mutually cooperate, and the outside cold gas enters the space between the explosion -proof pipe and reation kettle body, and then even cooling is carried out to reation kettle body, and then gas is discharged to the outside from the gas outlet pipe, and the device has the advantages that the explosion -proof effect is good.

This invention relates to the field of solid propellant technology, specifically disclosing a neutral polymer bonding agent, its preparation method, and its application in solid propellants. The neutral polymer bonding agent is prepared by polymerization of poly(hydroxyalkyl polyacrylate) and cyanoacetic acid as raw materials. It can achieve controllable molecular weight and controllable proportion of functional groups in the polymer. Moreover, the active group -CN in the neutral polymer bonding agent has low steric hindrance and is more easily adsorbed on the surface of ammonium nitrate particles, thereby improving the bonding effect.

The invention relates to the technical field of emulsion explosives, and particularly discloses a formula and a preparation method of an underground mine blasting mixed emulsion explosive. The underground mine blasting mixed emulsion explosive comprises the following components in percentage by mass: 73-78% of ammonium nitrate, 3-5% of sodium nitrate, 0.2-0.4% of thiourea, 2-5% of an oil phase component, 1-3% of a compound emulsifier, 0.3-0.5% of a sensitizer, 0.8-1.5% of hollow glass balls and the balance of water, the compound emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soya bean lecithin, and the sensitizer is composed of ethanolamine nitrate and phosphoric acid; according to the invention, by optimizing the proportion of each component, adopting an efficient emulsification process under a mild condition and synergistically optimizing each component, the product has good explosion performance and safety and can adapt to different mine environments, meanwhile, the stability of the emulsion explosive in a low-temperature environment is ensured, and the problem of miss-fire explosion in winter is effectively overcome.

The invention discloses a fuel gas rock cracking agent and a preparation method thereof, and belongs to the technical field of gunpowder. In order to solve the technical problems of danger in reprocessing of propellant powder, low utilization rate, environmental pollution and the like, the invention provides a gas rock cracking agent which comprises the following components: 25-75% of main charge, 20-70% of performance regulator and 2-5% of curing agent, the main charge is at least one of single-base propellant powder, double-base propellant powder or three-base propellant powder, the performance regulator is at least one of ammonium nitrate, potassium nitrate, sodium nitrate and ammonium dinitramide, and the curing agent is nitrocotton. The gas rock cracking agent is stable and free of overall explosion hazard, has the characteristics of low vibration, controllable flying rocks, clean products and the like when being used for rock cracking, and can well meet rock cracking operation under sensitive environments and various special working conditions; by adopting a wet mixing process, the fire blast risk caused by friction and static electricity in the mixing process of the propellant powder and the performance regulator can be effectively reduced.

This proposal discloses an additive and method for producing ultra-thin electrolytic copper foil with high tensile strength and high elongation. The additive comprises an inorganic nitrate and an organic compound; the inorganic nitrate is one or a combination of ammonium nitrate, copper nitrate, and bismuth nitrate; and the organic compound is a crown ether, a cyclic alcohol, and glycolic acid. By adding the inorganic nitrate / organic compound additive, the present invention produces ultra-thin electrolytic copper foil with a thickness of 6 μm or less, achieving a tensile strength exceeding 500 MPa and an elongation exceeding 5%.

The utility model relates to the technical field of material storage equipment, and discloses a porous granular ammonium nitrate stock bin which comprises an upper stock bin and a controller, a stock bin top cover is fixed at the top of the upper stock bin, a speed reducer is fixed in the center of the top of the stock bin top cover, the rotating end of the speed reducer penetrates through the stock bin top cover and is fixedly provided with a rotating shaft, and the rotating shaft is connected with the controller. A plurality of stirring blades are fixed at equal intervals in a circle center array on the outer surface of the rotating shaft. According to the utility model, by adopting the two feed ports, the conical height of porous granular nitric acid accumulated at the feed ports is reduced, so that the space utilization rate of the stock bin in a natural feeding state is improved, and the accumulation height can be reduced by half compared with the accumulation height of one feed port; the material level sensor conveys the material to the controller, and the controller starts the speed reducer to drive the rotating shaft and the stirring blades to flatten the stacked materials at the two discharging openings, so that the space utilization rate of the stock bin is increased.

The invention discloses an ammonium nitrate solution devitrification point testing device and method.The device comprises a water bath box and a sample cup, a supporting assembly is arranged at one end of the water bath box, a testing assembly is arranged in the supporting assembly, the supporting assembly comprises a clamping ring, and the outer wall of the bottom of the water bath box is fixedly sleeved with the clamping ring; and the outer wall of the water bath box is movably sleeved with an annular rotating plate. The temperature sensed by the infrared temperature sensing probe and the conductivity sensed by the detection electrode are displayed through the digital display, the conductivity suddenly changes along with gradual reduction of the temperature when the temperature reaches the crystallization point temperature, the system automatically records and stores the temperature at the moment, namely the temperature of the crystallization point of the ammonium nitrate solution, and if the temperature difference between the environment temperature and the solution temperature is small, the temperature is not changed. The temperature of the solution is slowly reduced, warm water can be input into the water bath box, the temperature in the sample cup is changed by controlling the cooling speed of the warm water in the water bath box, the temperature is controlled to be slowly reduced, and the data of the crystallization point of the ammonium nitrate solution is accurately detected.

The invention discloses a composite propellant containing a high-nitrogen ferrocene derivative and a preparation method of the composite propellant. The composite propellant is prepared from the following components: 14.05% of hydroxyl-terminated polybutadiene (HTPB), 7.03% of diisooctyl sebacate (DOS), 0.92% of 2, 4-toluene diisocyanate (TDI), 1% of the high-nitrogen ferrocene derivative, 59% of ammonium perchlorate (AP) and 18.00% of aluminum powder (Al). N, N-dimethylaminomethylferrocene in the three high-nitrogen ferrocene derivatives has the effects of improving the burning rate of the composite propellant and reducing the pressure index as the ferrocene derivative, nitrate, picric acid, 3-nitro-1, 2, 4-triazole-5-ketone and the like are rich in C, H, O and N elements, and are similar to oxidizing agents such as typical components ammonium nitrate, HMD and the like in the composite propellant; the fuel can be decomposed to provide energy for propellant combustion; the propellant has a low combustion rate pressure index in a pressure range of 1-10 MPa, and has more excellent combustion stability.

The utility model relates to the technical field of on-site explosive loading, in particular to a blast hole filling length measuring device based on an on-site mixed loading ammonium nitrate fuel oil explosive truck, which is used for the mixed loading explosive truck and comprises a top spiral cylinder connected with the tail end of a top spiral of the mixed loading explosive truck. A pulley is connected to the mounting base through a pin shaft, an inner groove is formed in the periphery of the pulley, a rope slides in the inner groove, the two ends of the rope are connected with a balancing weight and a tension sensor respectively, a depth sensor is arranged in the balancing weight, and after the balancing weight is arranged at a preset position in a blast hole, explosive can be fed into the blast hole in real time; compared with the conventional mode of manually measuring the filling length of the blast hole after filling the explosive, the method provided by the utility model has the advantage that the measuring efficiency is obviously improved.

The utility model relates to the technical field of porous granular ammonium nitrate fuel oil explosive production equipment, and particularly discloses a porous granular ammonium nitrate feeding device. Comprising a hopper, a spiral conveyor, bag breaking mechanisms and a driving mechanism, the top of the hopper is open, a discharging opening in the bottom of the hopper is connected with a feeding opening of the spiral conveyor in a sealed mode, the two bag breaking mechanisms are arranged in the upper portion of the hopper in a swinging mode, and each bag breaking mechanism comprises a bag breaking claw and swing arms fixed to the two ends of the bag breaking claw; two groups of driving mechanisms connected with the upper ends of the swing arms of the corresponding bag breaking mechanisms are arranged on the outer side of the hopper; the two bag breaking claws are driven by the air cylinder of the driving mechanism to swing in the opposite directions to tear the bottom of the ton bag, traditional manual cutting at the bottom of the ton bag is replaced, the risk that personnel are injured by the ton bag is avoided, meanwhile, the screen and the iron removing rod are arranged in the hopper, porous granular ammonium nitrate is filtered and iron is removed, and the production efficiency is improved. Impurities such as iron and nickel are prevented from being mixed into porous granular ammonium nitrate, and the accidental explosion risk is reduced.

The application discloses a method and system for preparing ammonium bifluoride from hydrofluoric acid waste liquid, which comprises the following steps: (1) adding the hydrofluoric acid waste liquid into an electrolytic cell, transporting the electrolytic cell to a first reaction kettle after electrodepositing treatment, adding silicon dioxide, then stirring and reacting, and returning the generated silicon tetrafluoride and hydrofluoric acid into a spray tower to react and then return to the first reaction kettle, and then adding ammonia water to perform neutralization reaction; (2) filtering the solid-liquid mixture I, evaporating and drying the obtained filtrate I to obtain an ammonium nitrate product, and returning the obtained filter cake I to a second reaction kettle, adding ammonia water to adjust the pH value, and then stirring and reacting; (3) filtering the solid-liquid mixture II, returning the obtained filter cake II to the first reaction kettle for reuse, transporting the obtained filtrate II to a reactor, adding hydrofluoric acid to perform reaction, and then performing evaporation and drying treatment to obtain an ammonium bifluoride product. The method is simple in process, low in energy consumption, convenient to operate and convenient for industrialized production and application.

The present application relates to the technical field of combustible substance detection in ammonium nitrate, and provides an automatic device for detecting combustible substance in ammonium nitrate, which comprises a reagent storage unit for storing ammonium nitrate sample, sodium persulfate reagent and phosphoric acid reagent; a CO2 infrared analyzer is connected with the reagent storage unit, the CO2 infrared analyzer can receive the reagent supplied by the reagent storage unit and determine the content of CO2 after the combustible substance in the ammonium nitrate sample is oxidized by the sodium sulfate reagent to form CO2; a controller controls the reagent storage unit to supply the reagent to the CO2 infrared analyzer, and receives and analyzes the content information of CO2 determined by the CO2 infrared analyzer to obtain the content of combustible substance in ammonium nitrate. The automatic device for detecting combustible substance in ammonium nitrate provided by the present application realizes efficient detection of combustible substance by using wet oxidation-infrared quantitative technology.

The utility model discloses a granular ammonium nitrate feeding device for an on-site mixed loading explosive truck, which comprises a feed box, a support frame is fixedly arranged on the periphery of the feed box, a discharge port is arranged at the lowest point of the feed box, and a discharge mechanism is arranged outside the discharge port. The discharging mechanism comprises a discharging cover plate covering the discharging port and a plurality of sets of driving connecting rods and driven connecting rods, one end of each driven connecting rod is hinged to one end of the corresponding driving connecting rod in the same set, the other end of each driven connecting rod is hinged to the discharging cover plate, the other end of each driving connecting rod is vertically and fixedly connected with an operating rod, and the operating rod is fixedly connected with the discharging port. The two ends of the operating rod are rotationally connected with the supporting frame in a shaft hole positioning mode, and the operating rod is perpendicularly and fixedly connected with a plurality of operating handles. The device has the advantages of being simple in structure, free of maintenance, convenient to use, low in energy consumption, small in equipment investment and the like.